Author(s) Ruhyadi, R.; Chen, Y.; Shen, N.; Yan, W.; Liang, Z.; Wang, H.; Wang, G.
Journal Bioresour Technol
Date Published 2019 Oct

Multiple uses of magnesium chloride during waste activated sludge (WAS) alkaline fermentation was investigated. The results revealed that a higher MgCl concentration inhibited acidogenesis, while the purity of volatile fatty acids (VFAs) improved and the maximum percentage of VFAs accounted for 52.92% (w/w) of soluble chemical oxygen demand (SCOD) at 120 mmol/L Mg. A phosphate removal efficiency of 81.22% was obtained at 15 mmol/L MgCl concentration, while only a 14.77% increase was observed when further MgCl was added (120 mmol/L MgCl). Capillary suction time (CST) values decreased sharply from 4410.20 s to 207.30 s with the increase of MgCl. A similar trend was observed in bound water and the minimum value was 85.56 ± 0.06%. The distribution of extracellular polymeric substances (EPS) and rheological profiles of the fermented sludge were also analyzed and the results confirmed that a high MgCl concentration had a positive effect on sludge dewatering.

DOI 10.1016/j.biortech.2019.121792
ISSN 1873-2976
Citation Bioresour Technol. 2019;290:121792.

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